All links have been updated.
(excluded univention-mozilla-firefox as this is correct)
(included link to produkt-feedback in UMC)
Fix: svn r58924
YAML: 2015-03-12-univention-management-console-frontend.yaml
YAML: 2015-03-12-univention-management-console-module-appcenter.yaml
No YAML for generate-appliance as it is unmaintained.